This free course was written by Liz Smith. It was first published in May 2019.
Except for third party materials and otherwise stated (see Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence.), this content is made available under a
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Course image: skynesher; iStockphoto.com
Figure 1: gustavofrazao; iStockphoto
Figure 2: Tero Vesalainen; iStockphoto.com;
Figure 3: krystiannawrocki; iStockphoto.com
Figure 4: scyther5;iStockphoto.com
Figure 5: ismagilov; iStockphoto.com
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